package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service//它使用了@Service注解，表示它是一个业务逻辑层的类，由Spring容器管理。
@Slf4j
public class CategoryServiceImpl implements CategoryService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增分类
     * @param categoryDTO
     */
    public void save(CategoryDTO categoryDTO) {
        //new一个数据库表格
        Category category = new Category();//创建了一个名为category的对象
        //拷贝属性
        BeanUtils.copyProperties(categoryDTO,category);
        //分类状态默认为禁用状态0
        category.setStatus(StatusConstant.DISABLE);
        //设置创建时间、修改时间、创建人、修改人
        /*category.setCreateTime(LocalDateTime.now());
        category.setUpdateTime(LocalDateTime.now());

        category.setCreateUser(BaseContext.getCurrentId());
        category.setUpdateUser(BaseContext.getCurrentId());*/
        categoryMapper.insert(category);


    }

    /**
     * 分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        PageHelper.startPage(
                categoryPageQueryDTO.getPage(),
                categoryPageQueryDTO.getPageSize());
        Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);
        long total = page.getTotal();
        List<Category> result = page.getResult();
        return new PageResult(total,result);
    }

    /**
     * 根据id删除分类
     * @param id
     */
    public void deleteById(Long id) {
        Integer count = dishMapper.countByCategoryId(id);
        if (count > 0){
            //TODO 判断当前分类是否关联了菜品，如果关联了则不能删除，抛出业务异常==(已经完善)
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //TODO 判断当前分类是否关联了套餐，如果关联了则不能删除，抛出业务异常==（已经完善）
        count = setmealMapper.countByCategoryId(id);
        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除分类数据
        categoryMapper.deleteById(id);
    }

    /**
     * 根据id修改分类信息
     * @param categoryDTO
     */
    public void update(CategoryDTO categoryDTO) {
        Category category = new Category();
        BeanUtils.copyProperties(categoryDTO,category);
//        category.setUpdateUser(BaseContext.getCurrentId());
//        category.setUpdateTime(LocalDateTime.now());
        categoryMapper.update(category);
    }

    /**
     * 启用禁用分类
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {

        Category category = Category.builder()
                .id(id)
                .status(status)
//                .updateUser(BaseContext.getCurrentId())
//                .updateTime(LocalDateTime.now())
                .build();
        categoryMapper.update(category);
    }

    /**
     * 根据类型查询分类
     * @param category
     * @return
     */
    public List<Category> list(Category category) {
        return categoryMapper.list(category);
    }
}
